After demons break through into the human world, Tokyo must be quarantined. Without power and stuck in a supernatural warzone, 17-year-old Kazuya has only one hope: He must use the COMP, a device created by his cousin Naoya capable of summoning and subduing demons, to defeat the invaders and take back the city. To do so, he will create a ragtag group including a master programmer, a cosplay idol, a bartender, and the leader of a street gang to turn back the demon invasion that has transformed Tokyo into a quarantined warzone.